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<!doctype html>
<html>
<head>
<title>Test k-rate AudioParams with inputs for AudioWorkletNode</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/webaudio/resources/audit-util.js"></script>
<script src="/webaudio/resources/audit.js"></script>
</head>
<body>
<script>
const audit = Audit.createTaskRunner();
// Use the worklet gain node to test k-rate parameters.
const filePath =
'../the-audioworklet-interface/processors/gain-processor.js';
// Context for testing
let context;
audit.define('Create Test Worklet', (task, should) => {
// Arbitrary sample rate and duration.
const sampleRate = 8000;
// Only new a few render quanta to verify things are working.
const testDuration = 4 * 128 / sampleRate;
context = new OfflineAudioContext({
numberOfChannels: 3,
sampleRate: sampleRate,
length: testDuration * sampleRate
});
should(
context.audioWorklet.addModule(filePath),
'Construction of AudioWorklet')
.beResolved()
.then(() => task.done());
});
audit.define('AudioWorklet k-rate AudioParam', async (task, should) => {
let src = new ConstantSourceNode(context);
let kRateNode = new AudioWorkletNode(context, 'gain');
src.connect(kRateNode).connect(context.destination);
let kRateParam = kRateNode.parameters.get('gain');
kRateParam.automationRate = 'k-rate';
kRateParam.value = 0;
let mod = new ConstantSourceNode(context);
mod.offset.setValueAtTime(0, 0);
mod.offset.linearRampToValueAtTime(
10, context.length / context.sampleRate);
mod.connect(kRateParam);
mod.start();
src.start();
const audioBuffer = await context.startRendering();
let output = audioBuffer.getChannelData(0);
// Verify that the output isn't constantly zero.
should(output, 'output').notBeConstantValueOf(0);
// Verify that the output from the worklet is step-wise
// constant.
for (let k = 0; k < output.length; k += 128) {
should(output.slice(k, k + 128), ` k-rate output [${k}: ${k + 127}]`)
.beConstantValueOf(output[k]);
}
task.done();
});
audit.run();
</script>
</body>
</html>
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